All I know is

we're here for some time, then we won't be. I'm not sure what's so wrong with that reality.

The desire to live forever has existed probably as long as there's been a concious human.

For all the people that choose cryonics, I say whoopee! I don't feel threatened by your beliefs or live in fear of you coming back and me not. And I doubt anyone else does either. Like the Witnesses at my door, you need to get over yourselves.

People believe in all kinds of things for all kinds of reasons. And they're welcome to it as far as I'm concerned.